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gh-110481: Non-limited Py_INCREF/DECREF() in cpython/object.h by vstinner · Pull Request #111505 · python/cpython · GitHub

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gh-110481: Non-limited Py_INCREF/DECREF() in cpython/object.h #111505

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gh-110481: Non-limited Py_INCREF/DECREF() in cpython/object.h #111505

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140 changes: 140 additions & 0 deletions Include/cpython/object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,146 @@
# error "this header file must not be included directly"
#endif

#if defined(Py_LIMITED_API) && (Py_LIMITED_API+0 >= 0x030c0000 || defined(Py_REF_DEBUG))
// Implemented in ../object.h
#else
static inline Py_ALWAYS_INLINE void Py_INCREF(PyObject *op)
{
// Non-limited C API and limited C API for Python 3.9 and older access
// directly PyObject.ob_refcnt.
#if defined(Py_NOGIL)
uint32_t local = _Py_atomic_load_uint32_relaxed(&op->ob_ref_local);
uint32_t new_local = local + 1;
if (new_local == 0) {
return;
}
if (_Py_IsOwnedByCurrentThread(op)) {
_Py_atomic_store_uint32_relaxed(&op->ob_ref_local, new_local);
}
else {
_Py_atomic_add_ssize(&op->ob_ref_shared, (1 << _Py_REF_SHARED_SHIFT));
}
#elif SIZEOF_VOID_P > 4
// Portable saturated add, branching on the carry flag and set low bits
PY_UINT32_T cur_refcnt = op->ob_refcnt_split[PY_BIG_ENDIAN];
PY_UINT32_T new_refcnt = cur_refcnt + 1;
if (new_refcnt == 0) {
return;
}
op->ob_refcnt_split[PY_BIG_ENDIAN] = new_refcnt;
#else
// Explicitly check immortality against the immortal value
if (_Py_IsImmortal(op)) {
return;
}
op->ob_refcnt++;
#endif
_Py_INCREF_STAT_INC();
#ifdef Py_REF_DEBUG
_Py_INCREF_IncRefTotal();
#endif
}

# if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
# define Py_INCREF(op) Py_INCREF(_PyObject_CAST(op))
# endif
#endif


#ifdef Py_NOGIL
// Implements Py_DECREF on objects not owned by the current thread.
PyAPI_FUNC(void) _Py_DecRefShared(PyObject *);
PyAPI_FUNC(void) _Py_DecRefSharedDebug(PyObject *, const char *, int);

// Called from Py_DECREF by the owning thread when the local refcount reaches
// zero. The call will deallocate the object if the shared refcount is also
// zero. Otherwise, the thread gives up ownership and merges the reference
// count fields.
PyAPI_FUNC(void) _Py_MergeZeroLocalRefcount(PyObject *);
#endif

#if defined(Py_LIMITED_API) && (Py_LIMITED_API+0 >= 0x030c0000 || defined(Py_REF_DEBUG))
// Implemented in ../object.h
#elif defined(Py_NOGIL) && defined(Py_REF_DEBUG)
static inline void Py_DECREF(const char *filename, int lineno, PyObject *op)
{
uint32_t local = _Py_atomic_load_uint32_relaxed(&op->ob_ref_local);
if (local == _Py_IMMORTAL_REFCNT_LOCAL) {
return;
}
_Py_DECREF_STAT_INC();
_Py_DECREF_DecRefTotal();
if (_Py_IsOwnedByCurrentThread(op)) {
if (local == 0) {
_Py_NegativeRefcount(filename, lineno, op);
}
local--;
_Py_atomic_store_uint32_relaxed(&op->ob_ref_local, local);
if (local == 0) {
_Py_MergeZeroLocalRefcount(op);
}
}
else {
_Py_DecRefSharedDebug(op, filename, lineno);
}
}
#define Py_DECREF(op) Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))

#elif defined(Py_NOGIL)
static inline void Py_DECREF(PyObject *op)
{
uint32_t local = _Py_atomic_load_uint32_relaxed(&op->ob_ref_local);
if (local == _Py_IMMORTAL_REFCNT_LOCAL) {
return;
}
_Py_DECREF_STAT_INC();
if (_Py_IsOwnedByCurrentThread(op)) {
local--;
_Py_atomic_store_uint32_relaxed(&op->ob_ref_local, local);
if (local == 0) {
_Py_MergeZeroLocalRefcount(op);
}
}
else {
_Py_DecRefShared(op);
}
}
#define Py_DECREF(op) Py_DECREF(_PyObject_CAST(op))

#elif defined(Py_REF_DEBUG)
static inline void Py_DECREF(const char *filename, int lineno, PyObject *op)
{
if (op->ob_refcnt <= 0) {
_Py_NegativeRefcount(filename, lineno, op);
}
if (_Py_IsImmortal(op)) {
return;
}
_Py_DECREF_STAT_INC();
_Py_DECREF_DecRefTotal();
if (--op->ob_refcnt == 0) {
_Py_Dealloc(op);
}
}
#define Py_DECREF(op) Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))

#else
static inline Py_ALWAYS_INLINE void Py_DECREF(PyObject *op)
{
// Non-limited C API and limited C API for Python 3.9 and older access
// directly PyObject.ob_refcnt.
if (_Py_IsImmortal(op)) {
return;
}
_Py_DECREF_STAT_INC();
if (--op->ob_refcnt == 0) {
_Py_Dealloc(op);
}
}
#define Py_DECREF(op) Py_DECREF(_PyObject_CAST(op))
#endif


PyAPI_FUNC(void) _Py_NewReference(PyObject *op);
PyAPI_FUNC(void) _Py_NewReferenceNoTotal(PyObject *op);

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